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Fold setcc instructions into select and branches that are not in the same BB as 

the setcc.

llvm-svn: 14212
This commit is contained in:
Chris Lattner 2004-06-18 00:29:22 +00:00
parent c37af629b4
commit b30d12292a
1 changed files with 2 additions and 4 deletions
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6
llvm/lib/Target/X86/InstSelectSimple.cpp
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@ -839,16 +839,14 @@ void ISel::getAddressingMode(Value *Addr, unsigned &BaseReg, unsigned &Scale,
// canFoldSetCCIntoBranchOrSelect - Return the setcc instruction if we can fold
// it into the conditional branch or select instruction which is the only user
// of the cc instruction. This is the case if the conditional branch is the
// only user of the setcc, and if the setcc is in the same basic block as the
// conditional branch. We also don't handle long arguments below, so we reject
// them here as well.
// only user of the setcc. We also don't handle long arguments below, so we
// reject them here as well.
//
static SetCondInst *canFoldSetCCIntoBranchOrSelect(Value *V) {
if (SetCondInst *SCI = dyn_cast<SetCondInst>(V))
if (SCI->hasOneUse()) {
Instruction *User = cast<Instruction>(SCI->use_back());
if ((isa<BranchInst>(User) || isa<SelectInst>(User)) &&
SCI->getParent() == User->getParent() &&
(getClassB(SCI->getOperand(0)->getType()) != cLong ||
SCI->getOpcode() == Instruction::SetEQ ||
SCI->getOpcode() == Instruction::SetNE))